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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Summary of Allowance for Doubtful Accounts and Revenue Adjustments [Table Text Block] |
Allowance for Doubtful Accounts, Revenue Adjustments and Other for the Years Ended: |  | Balance at Beginning of Year |  |  | Charged to Expense/ Against Revenue |  |  | Write-Offs, Net of Recoveries |  |  | Balance at End of Year |
December 31, 2016 |  |  | 9.9 |  |  |  | 19.5 |  |  |  | (16.0 | ) |  |  | 13.4 |
December 31, 2017 |  |  | 13.4 |  |  |  | 29.3 |  |  |  | (18.7 | ) |  |  | 24.0 |
December 31, 2018 |  |  | 24.0 |  |  |  | 35.7 |  |  |  | (23.9 | ) |  |  | 35.8 |

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